:root {
  --bg: #0b0c10;
  --card: #111317;
  --soft: #1a1d23;
  --text: #e6edf3;
  --muted: #9aa7b2;
  --brand: #6ae3ff;
  --ring: rgba(106, 227, 255, .35);
  --cat-ai: #a78bfa;
  --cat-fullstack: #34d399;
  --cat-research: #fbbf24;
  --cat-hackathon: #f472b6;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --card: #ffffff;
    --soft: #eef2f6;
    --text: #0f172a;
    --muted: #475569;
    --brand: #0ea5e9;
    --ring: rgba(14, 165, 233, .18);
    --cat-ai: #7c3aed;
    --cat-fullstack: #059669;
    --cat-research: #d97706;
    --cat-hackathon: #db2777;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--brand); text-decoration: none; transition: color .15s ease; }
a:hover { text-decoration: underline; }

/* ── Layout ── */
.container { width: min(1100px, 90%); margin: 0 auto; }
.wrap { padding: 0 0 100px; }

/* ── Hero ── */
header.hero {
  position: relative;
  padding: 80px 0 60px;
  overflow: hidden;
  width: 100%;
}
header.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, #6ae3ff, #a78bfa, #3b82f6, #6ae3ff);
  background-size: 300% 300%;
  animation: gradient-shift 12s ease infinite;
  opacity: 0.12;
  z-index: 0;
  will-change: background-position;
}
header.hero::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 80px;
  background: linear-gradient(to bottom, transparent, var(--bg));
  z-index: 1;
}
header.hero > * { position: relative; z-index: 2; }

@keyframes gradient-shift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(106, 227, 255, .08);
  border: 1px solid rgba(106, 227, 255, .2);
  color: var(--brand);
  animation: pulse-ring 3s ease infinite;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
@keyframes pulse-ring {
  0%, 100% { box-shadow: 0 0 0 4px var(--ring); }
  50% { box-shadow: 0 0 0 8px transparent; }
}

h1 {
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 16px 0 0;
  background: linear-gradient(135deg, var(--text) 40%, var(--brand));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
@supports not (-webkit-background-clip: text) {
  h1 { color: var(--text); }
}

p.lead {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: clamp(15px, 2vw, 18px);
  max-width: 65ch;
  line-height: 1.7;
}

.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,.1);
  background: var(--card);
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  transition: all .2s cubic-bezier(.4,0,.2,1);
  box-shadow: 0 1px 2px rgba(0,0,0,.08);
}
.btn:hover {
  transform: translateY(-2px) scale(1.02);
  box-shadow: 0 8px 24px rgba(0,0,0,.15);
  text-decoration: none;
}
.btn.primary {
  background: linear-gradient(135deg, var(--brand), #59c2d6);
  color: #0b1215;
  border-color: transparent;
  font-weight: 700;
}

/* ── Sections ── */
section {
  margin-top: 72px;
  position: relative;
}

.section-title {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 0 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-title::after {
  content: '';
  display: inline-block;
  width: 40px;
  height: 3px;
  border-radius: 2px;
  background: var(--brand);
  opacity: 0.6;
}

/* ── Cards ── */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  align-items: start;
}
@media (min-width: 760px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1040px) { .cards { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 14px;
  padding: 20px;
  display: grid;
  gap: 10px;
  position: relative;
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(400px circle at var(--mx, 50%) var(--my, 50%), rgba(106,227,255,.04), transparent 60%);
  pointer-events: none;
  opacity: 0;
  transition: opacity .3s ease;
}
.card:hover::before { opacity: 1; }
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(0,0,0,.12), 0 0 0 1px rgba(106,227,255,.1);
}

.card h3 { font-size: 17px; font-weight: 700; }
.card .meta { color: var(--muted); font-size: 13px; margin: 0; }

/* Category accents */
.card[data-category~="ai"] { border-left: 3px solid var(--cat-ai); }
.card[data-category~="fullstack"] { border-left: 3px solid var(--cat-fullstack); }
.card[data-category~="research"] { border-left: 3px solid var(--cat-research); }
.card[data-category~="hackathon"] { border-left: 3px solid var(--cat-hackathon); }

.tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  letter-spacing: .02em;
  text-transform: uppercase;
}
.tag.ai { background: rgba(167,139,250,.15); color: var(--cat-ai); }
.tag.fullstack { background: rgba(52,211,153,.15); color: var(--cat-fullstack); }
.tag.research { background: rgba(251,191,36,.15); color: var(--cat-research); }
.tag.hackathon { background: rgba(244,114,182,.15); color: var(--cat-hackathon); }
.tag.misc { background: rgba(106,227,255,.1); color: var(--brand); }

.list {
  display: grid;
  gap: 6px;
  padding-left: 16px;
  margin: 0;
  font-size: 14px;
  line-height: 1.6;
}
.list li { margin: 0; }

/* ── Skill Chips ── */
.skill-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.08);
  background: var(--soft);
  font-size: 12px;
  font-weight: 500;
  color: var(--muted);
  transition: all .2s ease;
}
.chip:hover { transform: translateY(-1px); }
.chip[data-group="language"] { border-color: rgba(167,139,250,.3); color: var(--cat-ai); }
.chip[data-group="framework"] { border-color: rgba(52,211,153,.3); color: var(--cat-fullstack); }
.chip[data-group="infra"] { border-color: rgba(96,165,250,.3); color: #60a5fa; }
.chip[data-group="ai"] { border-color: rgba(244,114,182,.3); color: var(--cat-hackathon); }
.chip[data-group="language"]:hover { background: rgba(167,139,250,.1); }
.chip[data-group="framework"]:hover { background: rgba(52,211,153,.1); }
.chip[data-group="infra"]:hover { background: rgba(96,165,250,.1); }
.chip[data-group="ai"]:hover { background: rgba(244,114,182,.1); }

/* ── Two Column ── */
.two-col { display: grid; grid-template-columns: 1fr; gap: 16px; }
.two-col > div, .two-col > aside { display: grid; gap: 16px; align-content: start; }
@media (min-width: 880px) { .two-col { grid-template-columns: 1.2fr .8fr; } }

.contact { display: grid; gap: 8px; }
.contact a { font-weight: 600; }

/* ── Footer ── */
footer {
  margin-top: 48px;
  padding: 24px 0 60px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid rgba(255,255,255,.06);
}

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Accessibility ── */
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
}

@media (hover: none) {
  .card::before { display: none; }
  .card:hover { transform: none; box-shadow: none; }
}

/* ── Mobile ── */
@media (max-width: 480px) {
  header.hero { padding: 48px 0 40px; }
  .actions { flex-direction: column; }
  .actions .btn { width: 100%; justify-content: center; }
  .card { padding: 16px; }
  section { margin-top: 48px; }
}